docs: def do_vim(self, arg):
          """v(im)
      switch to debugging with vimpdb"""
          self.vimpdb = make_instance()
          self.vimpdb.set_trace_without_step(self.botframe)
          if self.has_gone_up():
              self.vimpdb.update_state(self)
              self.vimpdb.cmdloop()
          else:
              self.vimpdb.interaction(self.curframe, None)
          return 1